Bipolar transistor-based linearizer with programmable gain and phase response system
US6750709B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2001 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | May 7, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/211
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bipolar transistor-based linearizer with programmable gain and phase response apparatus uses a splitter to separate an incoming RF signal into two equal components: in-phase (I) and quadrature (Q, ninety degrees delayed). The I signal then passes through a first bipolar variable gain amplifier (VGA) while the Q signal passes through a second bipolar VGA. After passing through the first and second VGAs, the amplified signals are combined at the output using a summer to produce a predistorted signal that drives a TWTA. The gains of each VGA are controlled using an RF power detector in conjunction with a bipolar gain/phase slope controller. Each gain can be adjusted separately to product a large range of linearization characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.